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Old 12-20-09 | 05:25 PM
  #16  
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sknhgy
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Joined: Aug 2006
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From: Illinois
I've thought about this but haven't gone to the trouble to try it: Put a dab of paint on the ground. Ride over it. Your tire should print a mark on the road the exact circumference of the tire. Measure the distance between paint marks on the road.
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